Merrell Refuge Pro GORE-TEX Waterproof Walking Boots Strobel Construction - Offers flexibility and ultimate comfort. Nubuck and Pig Suede Upper - This soft, comfy and waterproof material is designed for super soft comfort. Bellows Tongue Cover - Protection from mud and debris from getting inside the shoe. Waterproof Membrane - treated with Aegis Antimicrobial solution provides impermeable but breathable barrier. Abrasion resistant heel-cap - Protects the heel in mountains and trail environments.